Sorry, no online dictionaries contain the exact phrase proven to be true.
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Reverse dictionary results:
1. induction
 2. testable
3. theorem
4. truth
5. wash
6. possible
7. unfalsifiable
8. apparent
9. certify
10. confirm
 11. establish
12. evidence
13. evident
14. fact
15. law
16. principle
17. proof
18. proofed
19. proofs
20. prove
 21. proving
22. show
23. showed
24. sure
25. was
26. were
27. demonstrate
28. tested
29. time-tested
30. alleged
 31. dogmatic
32. provable
33. substantiated
34. untrue
35. cleared
36. conspicuous
37. documented
38. obvious
39. probity
40. proved

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